12365440 has 48 divisors (see below), whose sum is σ = 29775330. Its totient is φ = 4910592.

The previous prime is 12365429. The next prime is 12365449. The reversal of 12365440 is 4456321.

It can be written as a sum of positive squares in only one way, i.e., 11128896 + 1236544 = 3336^2 + 1112^2 .

It is not an unprimeable number, because it can be changed into a prime (12365449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 88891 + ... + 89029.

Almost surely, 2^12365440 is an apocalyptic number.

12365440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12365440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14887665).

12365440 is an abundant number, since it is smaller than the sum of its proper divisors (17409890).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12365440 is an frugal number, since it uses more digits than its factorization.

12365440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297 (or 146 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 12365440 is about 3516.4527581072. The cubic root of 12365440 is about 231.2436725807.

The spelling of 12365440 in words is "twelve million, three hundred sixty-five thousand, four hundred forty".